Here is the full list of all 24 Yu-Gi-Oh Legacy of the Duelist : Link Evolution achievements.
Win All Duelist Challenges
Unlock all avatars
Defeat Yu-Gi-Oh! ZEXAL Campaign
Defeat Yu-Gi-Oh! ARC-V Campaign
Win a ranked multiplayer match (duel)
Defeat Yu-Gi-Oh! 5D's Campaign
Win a Battle Pack match (duel)
Defeat Yu-Gi-Oh! GX Campaign
Win an unranked multiplayer match (duel)
Deal 50k Damage with Defending Monsters
Chain 100 times
Deal 100k in Effect Damage
Defeat Yu-Gi-Oh! VRAINS Campaign
Defeat Yu-Gi-Oh! Campaign
Deal 200k Damage with Attacking Monsters
Create 5 decks
Perform a Link Summon
Perform a Pendulum Summon
Perform a Synchro Summon
Perform an Xyz Summon
Create your first deck
Perform a Fusion Summon
Win a duel by having all Exodia cards in hand
Perform a Tribute Summon